Added package duro.io in which a TreeWriter, with indention/dedention support, is contained.
Added package duro.io in which a TreeWriter, with indention/dedention
support, is contained.

Signed-off-by: Jakob Brandsborg Ehmsen <387ed33cc9ebf98b733caa2520baacd616b28aa5@gmail.com>
jakobehmsen/duro